Half to i



(No Model.)

W. H. MOHR.

BIT HOLDER.

Patented Sept'. 7,1897.

fire/75m- @U william HWO?? @M j jf y@ UNITED STATES PATENT EEicE.

1WILLIAM II. MOIIR, OF PLANTSVILLE, CONNECTICUT, ASSIGNOR OF ONE- IIALF TO I. S. BAILEY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 589,608, dated. September '7, 1897".

application and March 16, 1897.

To LZ whom, t may concern.-

Be it known that LWILLIAM H. Molina citi-v zen of the United States,'residing at Plantsville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Bit-I'Ioldersf which the following is a specification.

^My invention relates to improvement-s in quick-actin g bit-holders 5 and the chief object of my invention is to provide a simple and eiiicient holder for bits in which the jaws may he closed by a partial rotation of the clamping-r1ng- In the accompanying drawings, Figure l is a side elevation of my bit-holder. Fig. 2 is a central longitudinal section thereof on the line a: ac of Fig.l. Fig. 3 is an end view thereof with one of the jaws in section and with the cap-ring removed. Fig. e is a detached side elevation of the clampingsring, and Fig. 5 is a transverse section on the line y y of Figs. 1 and 2 with the holding-jaws removed.

The head A may be connected by its shank to any ordinary bit-stock. It is slotted longitudinally on two sides to receive the Shanks 6 of the holdingjaws 7 and is also provided' closes a sliding pawl 12, and a spring 13, saidV pawl beingprovided with a projecting operating-handle let, that extends through the slot 15 ofsaid sleeve. The front end of the sleeve or collar l0 is counterbored and receives within it the reduced inner end 16 of the clampingring l?, which surrounds the jaws 7 and head A a little back :from the ends of said jaws. The central portion of this clamping-ring projects outwardly beyond the other parts and is provided with a knurled surface, as shown, as in analogous tools, to furnish a better grip for the hands. The reduced inner end 16 is provided with a holdinggroove 1S, into which a pin I9 in the sleeve 10 extends for the purpose of holding the clampingsleeve 17 against longitudin al movement. In order to assemble v the parts after this pin is fixed in place in the sleeve l0, the 'reduced inner end 1G may be slotted upon one side at 20, as shown in Figs. d and 5, so that when the collar or sleeve lO is slipped upon the head the pin majy pass through said slot into the' groove 1S, after which said sleeve is partially rotated and secured in place. In order to make a better iinish, I provide the holding-sleeve 17 with a short reduced outer end 21, having an annular groove 22, and place over the outer end of the jaws and in front of the main portion of the clamping-rin g the slotted cap-ring 23, and secure the saine in place by a pin 2S, which extends into the groove 22 of the reduced outer end 2l.

'The interior of the clamping-ring 17 is provided with two cams 24, which embrace suhstantiallyhalf a circle each, as best shown in Fig. These cams are designed to bear upon the outer side of the jaws 7 to force them together, and the corresponding part of each jaw is beveled, as at 25, Figs. 2 and In said Fig. 3 one of the jaws is in section, and its larger' contour is indicated by broken lines. The back or inner edge of the reduced inner end 16 on the canrring 17 is provided for a portion of its way with ratchet-teeth 26, Fig. 4, with which teeth the pawl l2 engages. In-the drawings the jaws are represented as in a partially-closed position. In order to rotate the holding-sleeve in the direction to' release the jaws, the pawl l2 is operated by its handle let to depress the. spring and withdraw the pawl from the ratchetteeth 2G, when the sleeve can quickly be turned backward until the shoulders 27 at the ends of the cams 2J: strike against the sides of the jaws. The jaws will spring open by reason of their elasticity. The shank of the bit may now be inserted between the jaws.

IOO

and lirmly hold the bit in place. At the same time the jmvs are operated by something less than half a turn of the @hun ping-ring, and by reason of beingr thus operated I term my device a quick-acting hit-holder.7 Inesniueh as the Clainpi1igri1ig 17 makes but about hall' n revolution, it is not necessary to forni ratchet-teeth on the whole extent of the edge of the reduced inner end 1G. rlhe longitudinal groove 2O in the redueed inner end 1G is so located, as shown in Fig. that in the ordinary operation of the clamping-ring the pin 19 will never be brought into a, position to register with seid longitudinal. `groove.

I do not wish to eoniine myself tothe exa-et details of construction, but reserve the right to marke such changes as may fairly fall Within. the Spirit tud Scope of niy invention.

l claim aS my invention@ l. The herein-described bit-holder, consisting of the head, provided with spring-jews and shank-.receiving socket, the sleeve 10 inelosing the Shanks of Suid jaws and fixed ou said head, and the cani-ring surrounding' the said jaws and head and having 2t reduced inner end fitted to and rotatingP Within the outer end of the said sleeve substantially as described.

2. The combination of the head having the shank-receiving soeket S, the spring-jews T secured thereon, the Clamping-ring having' internal earns, and Secured against longitudinal movement upon said head and also provided With ratchet-teeth on its inner end, the sleeve 10 inclesing the Shanks of the said juvs and :iixed on said head7 and :t springpztivl in the outer end of the said sleeve for engaging the i-zrteliet-teeth of the cam-ring, the engaging faces of the said ratchet-teeth and pmvl being eonstruetedffor permitting the cam-ring to turn freely in the direction to tighten the j uws substantially its described.

. XVILLIAM H. MOHR. lVitnesses:

E. E. S'roiv, MARK M. BENNETT. 

